org.apache.commons.math3.ode
public interface FirstOrderDifferentialEquations
This interface should be implemented by all real first order
differential equation problems before they can be handled by the
integrators FirstOrderIntegrator.integrate(org.apache.commons.math3.ode.FirstOrderDifferentialEquations, double, double[], double, double[])
method.
A first order differential equations problem, as seen by an
integrator is the time derivative dY/dt
of a state
vector Y
, both being one dimensional arrays. From the
integrator point of view, this derivative depends only on the
current time t
and on the state vector
Y
.
For real problems, the derivative depends also on parameters that do not belong to the state vector (dynamical model constants for example). These constants are completely outside of the scope of this interface, the classes that implement it are allowed to handle them as they want.
FirstOrderIntegrator
,
FirstOrderConverter
,
SecondOrderDifferentialEquations
Modifier and Type  Method and Description 

void 
computeDerivatives(double t,
double[] y,
double[] yDot)
Get the current time derivative of the state vector.

int 
getDimension()
Get the dimension of the problem.

int getDimension()
void computeDerivatives(double t, double[] y, double[] yDot) throws MaxCountExceededException, DimensionMismatchException
t
 current value of the independent time variabley
 array containing the current value of the state vectoryDot
 placeholder array where to put the time derivative of the state vectorMaxCountExceededException
 if the number of functions evaluations is exceededDimensionMismatchException
 if arrays dimensions do not match equations settingsCopyright © 2003–2015 The Apache Software Foundation. All rights reserved.